In addition, the cross-sex discrepancy in average weight may be explained thusly:

Coyote UglyA situation encountered after a night of consuming alcohol whereby a person, usually male, wakes the next morning in a strange bed with a sexual partner from the previous evening who is completely physically undesirable (see ugly, nasty, two bagger) and sleeping on the man's arm. The hapless male would rather gnaw off his own arm than wake the woman and have to face the ills of his intoxicated choices the previous evening. Originating from a phenomena whereby a coyote captured in a jaw trap will chew off its own leg to escape certain death.